T. P. Traitement du Signal MaÃ®trise E.E.A. - LASC

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6 SPTool: A Signal Processing GUI Suite You can change the filter representation from the default transfer function to another form by using the tf2ss or tf2zp functions. The Fs Field: Accessing Filter Sample Frequency The Fs field contains the sampling frequency of the filter in hertz. The specs Field: Accessing other Filter Parameters The specs field is a structure containing parameters that you specified for the filter design. The first field, specs.currentModule, contains a string representing the most recent design method selected from the Filter Designer’s Algorithm list before you exported the filter. The possible contents of the currentModule field and the corresponding design methods are shown below. Contents of the currentModule field fdbutter fdcheby1 fdcheby2 fdellip fdfirls fdkaiser fdremez Design Method Butterworth IIR Chebyshev Type I IIR Chebyshev Type II IIR Elliptic IIR Least Squares FIR Kaiser Window FIR Equiripple FIR Following the specs.currentModule field, there may be up to seven additional fields, with labels such as specs.fdremez, specs.fdfirls, etc. The design specifications for the most recently exported filter are contained in the field whose label matches the currentModule string. For example, if the specs structure is filt1.specs ans currentModule: 'fdremez' fdremez: [1x1 struct] 6-36
Accessing Filter Parameters the filter specifications are contained in the fdremez field, which is itself a data structure. The specifications include the parameter values from the Specifications region of the Filter Designer, such as band edges and filter order. For example, the filter above has the following specifications stored in filt1.specs.fdremez: filt1.specs.fdremez ans = setOrderFlag: 0 type: 3 f: [0 0.2000 0.3000 0.5000 0.6000 1] m: [6x1 double] Rp: 0.0100 Rs: 75 wt: [3.2371 1 3.2371] order: 78 Because certain filter parameters are unique to a particular design, this structure has a different set of fields for each filter design. The table below describes the possible fields associated with the filter design specification field (the specs field) that can appear in the exported structure. Parameter Beta f Fpass Fstop Description Kaiser window β parameter. Contains a vector of band-edge frequencies, normalized so that 1 Hz corresponds to half the sample frequency. Passband cutoff frequencies. Scalar for lowpass and highpass designs, two-element vector for bandpass and bandstop designs. Stopband cutoff frequencies. Scalar for lowpass and highpass designs, two-element vector for bandpass and bandstop designs. 6-37
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T. P. Traitement du Signal Maîtris
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a=[1 2; 3 4] et le résultat suivan
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y=exp(i*2*pi*t) que l’on rencontr
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t=0:T/N:T-T/N; y=t.^2+5; plot(t,y);
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t f ∫ t0 f ( t) dt t ⎡ N −1 e
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TP 2 : ANALYSE ET SYNTHÈSE DE SIGN
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Relations entre la série de Fourie
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) Rampe Montrer que: c) Signal modu
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- Pour le signal c), vérifiez que
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Cette figure montre bien qu’il es
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N correspond aux nombres d’échan
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2) Travail demandé 2-1) Analyse d
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TP 4 : UTILISATION DE LA TFD POUR L
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N −1 ∑ x( p)* y( p) = x( m) y(
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c) Autocorrélation d'un sinus brui
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T. P. Traitement du Signal MaÃ®trise E.E.A. - LASC

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